Application of anisotropy of magnetic susceptibility to construct the palaeocurrent direction using slender fossil orientations

Oriented samples were collected in the southern Mongolia Plateau and north‐eastern Tibetan Plateau to detect links between microstructural features, which are inferred from magnetic fabrics, and outcrop‐scale sedimentary structures that include slender fossil orientations. Palaeocurrent imprints in...

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Bibliographic Details
Published in:Geological journal (Chichester, England) England), 2023-03, Vol.58 (3), p.1101-1110
Main Authors: Wei, Xiaohao, Zhang, Rui
Format: Article
Language:English
Subjects:
Anisotropy
anisotropy of magnetic susceptibility
Compression
Direction
Erlian Basin
Fabrics
fossil orientations
Fossils
Kinetics
Linxia Basin
Magnetic permeability
Magnetic susceptibility
Outcrops
palaeocurrent dynamics
petrofabric
Samples
Sediment
Sedimentary structures
Sediments
Statistical methods
Susceptibility
Tectonics
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Summary:Oriented samples were collected in the southern Mongolia Plateau and north‐eastern Tibetan Plateau to detect links between microstructural features, which are inferred from magnetic fabrics, and outcrop‐scale sedimentary structures that include slender fossil orientations. Palaeocurrent imprints in particles and their recognition in magnetic fabrics depend on the kinetics of current and any post‐depositional reworking. Here, we restored the flooding palaeocurrent direction through the statistical orientation of slender fossils and imprints indicated by magnetic fabric patterns in the sediments. We found that the tilt response of the minimum susceptibility axes preserves more links to the dynamic orientation of fossil deposits, while the maximum susceptibility axes may be easily reworked by a weak but long‐term tectonic compression. Comparing the two methods reveals the correlation between fossil distribution and magnetic fabric. The dynamic identification of anisotropy of magnetic susceptibility on large quantitative samples contributes to provide an alternative way for further statistics of fine‐grained sediments and fabric arrangement. We compared outcrop scale slender fossil orientations and microstructural features of magnetic fabrics collected from two sections in the north‐eastern Tibetan Plateau and southern Mongolia Plateau. We found palaeocurrent imprints in particles and their recognition in magnetic fabrics depend on the kinetics of current and any post‐depositional reworking including tectonics.
ISSN:0072-1050
1099-1034
DOI:10.1002/gj.4645